Audit stdlib object annotations (#9519)

stdlib/sunau.pyi

@@ -1,5 +1,5 @@
 import sys
-from _typeshed import Self
+from _typeshed import Self, Unused
 from typing import IO, Any, NamedTuple, NoReturn, overload
 from typing_extensions import Literal, TypeAlias
 
@@ -33,7 +33,7 @@ class _sunau_params(NamedTuple):
 class Au_read:
     def __init__(self, f: _File) -> None: ...
     def __enter__(self: Self) -> Self: ...
-    def __exit__(self, *args: object) -> None: ...
+    def __exit__(self, *args: Unused) -> None: ...
     def getfp(self) -> IO[bytes] | None: ...
     def rewind(self) -> None: ...
     def close(self) -> None: ...
@@ -53,7 +53,7 @@ class Au_read:
 class Au_write:
     def __init__(self, f: _File) -> None: ...
     def __enter__(self: Self) -> Self: ...
-    def __exit__(self, *args: object) -> None: ...
+    def __exit__(self, *args: Unused) -> None: ...
     def setnchannels(self, nchannels: int) -> None: ...
     def getnchannels(self) -> int: ...
     def setsampwidth(self, sampwidth: int) -> None: ...